| 摘要 |
<p>A single-phase or three-phase vacuum power interrupting device comprises a vacuum power interrupter (3) which includes a bell-shaped metallic casing (13), a ceramic insulating circular end plate (14) fitted to the open end of the bell-shaped metallic casing, and a pair of electrical contact rods (18, 20) having electrical contacts (11, 12) and partially extending within the casing, being normally in contact with each other or moving away from each other, and an insulating molded block (2) made of a resin into which the outer peripheral surface of a radially extending portion (13a) of the bell-shaped metallic casing (13) and insulating circular end plate (14) are integrally embedded, whereby the atmospheric creepage distance from the movable electrical contact rod (18) serving as an electrically charged portion is increased so that the atmospheric dielectric strength of the vacuum power interrupter becomes greater and a larger current with higher voltage can be interrupted. </p> |
